Reamer



May 2, 1939. J. A. ZUBLIN 56 4 REAMER Filed Aug. 29, 1958 Patented May 2, 19 39 UNITED STATES PATENT OFFlCE Rm. John A. Zublin, Los Angeles, Calif. Application August 29, 1938, semi No. 227,278 I ii-claims. (01. 255-73). Q

This invention relatesto rotary drilling tools for producing .bore holes'in the earth,-'and more particularly to a: reamer having roller cutters mountedthe'reon. w I v g It is an'object of this invention to provide aireamer having roller cutters that are easily assembled to a supporting shank and disassembled therefrom.

A further objectof the invention is concerned 10 with a reamer having roller ,cutter assemblies that can be attached to their supporting shank at various distances from the center line of the reamer, thereby. making it possible to use the same sizes of parts for producing different bore 18 hole diameters. v

Still another object of the invention is to attach cutters to a supporting body by suitable means and to prevent loss of thecutters in the event of failure of the particular means used.

20 It is preferred that the attaching means be welded material.

This invention possesses many other'advantages and has other objects that will become apparent from a consideration of an embodiment of the invention For this purpose, a form is shown in the drawing accompanying and forming part of'tlie' present specification, which embodiment will now be described indetail; illustrating the general principles of the invention.

30 However, it is to-be understood that this detailed description is not to be taken in a limited sense, since the scope of the invention is best defined by the appended claims.

Referring to the drawing:

35 Figure 1 is a side elevation of .a reamer embodying the invention, parts beingv shown in section. s

Figure 2 is anelevation of a reamer as seen from the right of Figure 1.- 1

40 Figure 3 is a transverse section taken along the plane3-3 of Figure '1. e.

' Figure 4 is a transverse section taken along the line 4-4 of Figure 1. I

'I'he reamer disclosed includes a supporting 46 body or shank in having a tapered threaded pin H at one end and suitable means, as a threaded box l2,-at the other end whereby the reamer can be attached to another rotary cutting tool or any other desired mechanism (not shown). The

50 reamerincludesa pair of circumferentially-adiacent roller cutter assemblies I3, i3 on one side and a single roller cutter assembly i4 substantially diametricallyaopposite the central plane of the first-mentioned pair of cutters. This arid rangement forms the subject matter of my application Serial No.218,491, filed July 11, 1938. Two coaxial cutters Ila, I3?) and a, llb are shown as being in each set, these cutters being rotatably mounted upon a bearing pin i5 secured to the shank III in the manner to be de- 5 scribed hereinafter. However, it is to be understood that although two coaxial. rollerslare mounted on each pin, a single roller or-inore than. two rollers can be used without departing from'the scope of the invention. a

The rollers are received by the shank within recesses'or grooves IS, the ends of which termihate in notches, l1 adapted to receive the ends iiia.v of the roller bearing pins ii.

The shank is provided with apassageway i8 for drilling-fluid which can pass through nozzles l9 communicatingwith the passageway I8 and therecesses or grooves I6 to direct a jet of drilling fiuidupon the cutter teeth to, clean them of adhering matter and assist their rotation on their bearingpins i5; all of which is described and claimed in my co-pending applications Se rial No. 218,491, filed July 11, 1938, and Serial No. 191,621, filed February 21, 1938. V

The roller cutters and their bearing plnsare so mounted on and supported by the shank as to be easily assembled thereto and disassembled therefromr ,In furtherance of this end, flat, generally rectangular plates 20; 20 are provided near the respective ends of the adjacent sets of ;co-'- axial rollers l3, these plates being afilxedto the adjacent portions of the bearing pins IS. The pins I5 pass through bores 2| formed in respective plates andare rigidly secured thereto by welding in the material 22 between the'outer surfacesof the pinsand the inner surface of the bores 23 in'the plates. To properly center the pins in the plates, the bore, diameter 230. adjacent the ends of the cutters is'only slightly larger than the, diameter of the pins in'order to 40 snugly fit therearound. The remainder of each plate bore 232: is enlarged to receive the welded material aforementioned.

Considering theright. sets of rollers I3, as seen in Figures 1 and 3, they. are assembled with'respect to the plates 20 and pins l5 by placing each pin. through one plate and through the rollers, after which the pin will pass through the other plate. The .welding' material 22 is then fused into the enlarged bore plate portions. A

similar procedure is adopted regarding the single set of rollers a, MD shown at the left of Figures land 3. However, the plates 'Mfor these ,rollersare preferably generally triangular in shape to provide a greater surface for their attachment to the shank, and also so that they will conform to the outer surface of the shank in the region of this set of rollers Ha, I 41).

After the pins l5 are Welded to the plates 20 or 24, each assembly l3 or M can be inserted into the grooves or recesses I6 with the ends lid of the pins I5 confined by the notches IT in the shank. The plates 20 or 24 are then integrated to the shank by welding inthe fillets 25 between the sides of the plates and the ends of the grooves. By reason of this welded inmaterial 25, each entire assembly is securely attached to the shank Ill. Whenever the cutters are worn and require replacementthe welded fillets 25 can be burned away by use, of a suitable cutting torch,,or other means, and-the assembly removed from the shank without any material damage thereto.

It will be noted that the ends l5a of the pins are not weldedto the shank, but that the sole means of attachment between the shank and the cutter assemblies H! or M is through the plates 20 or 24. This has a decided advantage over a construction in which the ends of the pins themselves are welded to the shank because of the ease with which'the cutter parts can be removed. There is a furtheradvantage in'that there is no necessity for accurate finishing of the notches I! or of precision drilling or reaming of aligned holes (not shown) to receive the ends of the pins. The notches can be cast sufliciently accurately to confine the ends of the pins and be positioned closely adjacent to them. They serve as a safety factor by preventing loss of the cutters and other partsin the hole in the event that the'welded fillets 25 become fractured. The sides of the notches will prevent movement of the pins laterally in at least three directions while the walls of the bore being drilled will prevent the cutter assembly from moving substantially radially outward 'in the event that the welds fail.

Due to the use of the plates, the-same diameter of cutters and pins canbe used for reaming a variety of bore holesifzes. "This will become apparent when it is realized that the assembly can be moved into the notchesl'l and grooves 6 at varying distances from the center line of the bit,

and the fillets 25 thereafter welded-in place- However, for rapidity in making the'assembly, at a consequent saving in the cost of manufacture, the bottom portions Ilia of the grooves l6 are preferably finished to engage a side surface 2011 or 24a of each plate. This arrangement will relieve the welds 25 'of substantially all strain since the loads encountered by the cutters will be transmitted from them through the pins and plates directly to the shank through the abutting shank and plate surfaces. With thisarrangement the same size cutters can'still be used for 1 reaming different size bore holes merely by the 'use of plates of different widths'which "will position the center line of the bearing pins differently with respect to the finished shank surfaces.

I claim:

1. A reamer including a shank provided with a circumferential groove, {roller cutter means within said groove, a bearing pin on which said cutter means is mounted, a plurality of plates to which said pin is fixed, and means for attaching said plates to said shank. V

2. A reamer including a shank provided with a circumferential groove, roller cutter means within said groove, a bearing pin on which said cutter means is mounted, a plurality of plates to which said pin is fixed, said plates having bores through which said pin extends and in which it is welded to said plates, and means for attaching said plates to said shank.

3. A reamer including a shank provided with a circumferential groove, roller cutter means within said groove, 2. bearing pin on which said cutter means is mounted, a plate at each end of the cutter means, the ends of said pin extending into and welded to respective plates, and saidplates welded to said shank.

4. A reamerincluding a shank provided with a circumferential groove and notches at the ends of said groove, roller cutter means within said groove,a bearing pin on which said cutter means is mounted, a'plate at each end of the cutter means, the ends of said pin extending through respective plates into respective notches, said pin being welded to said plates, and said plates being welded to said shank.

5. A reamer including a shank provided with a circumferential groove having bottom and end walls, notches in said shank adjacent said end walls, roller cutter means within said groove, a bearingpin on which said cutter means is mounted, a" plate at each end of the cutter means, the ends of said pin extending through respective plates into respective notches, said pin" being welded to saidplates, and said plates engaging saidbottom wall and welded to said end walls.

6. A reamer including a shank provided with. a circumferential groove having bottom and end walls,.notches'in said shank adjacent'said .end walls, roller cutter means within saidgroove, a bearing pin on which said cutter meansis mounted, a plate ateach end of the cutter means, the ends of said pin extending through respective plates into respective notches, said plates having respective enlarged bores in which said pin is welded to each plate, and said plates-engaging said bottom wall and welded to said end walls.

7.- A- reamer including a shank provided with a circumferential groove having bottom, and end.

open side portions of the groove.

8. A reamer including aunitary shank provided with a circumferential groove having bottom and end walls and also an outwardly opening notch adjacent each end wall, said shank being open at the side portions of the groove between the end walls, roller cutter means within said groove,

a bearing pin on which said cutter means is mounted, a plate at each end of the cutter means, the ends of said pin beingsecured to said plates and extending therethrough into respective notches, said plates engaging said bottom wall and welded to said end walls near the-open side portions of the groove.

9. A reamer including a shank provided with a'circumferential groove having bottom and end walls, said groove being open at its side portions between said end walls, said shank having a plurality of outwardly opening notches adjacent 'each end wall, bearingpins having end portions within said notches, a plate adjacent each end wall through which said pins extend and to which they are secured, said plates being welded to said tend and to which they are secured, said plates being welded to said end walls.

11. A reamer cutter assembly comprising a pair of plates each having a bore therethrough, ,a

bearing pin in said bores extending through and projecting beyond said plates, said pin being secured to said plates .by welding material in said bores circumferentially around said pin, and roller cutter means mounted on said pin between said plates. l

12. A reamer cutter assembly comprising a pair of platea each having a bore therethrough, a

bearing pin in said bores extending through and projecting beyond said plates, each bore having a diameter to center the pin in the plates and an enlarged diameter to form a circumferential recess to receive'welding material for securing the pin to the plates, and roller cutter means mounted on said pin between said'plates.

13. A reamer cutter assembly comprising an upper plate and a lower plate, a pair of bores in said upper plate; a. pair of bores in said lower plate in alignment with the bores in said upper plate, bearing pins-extending into aligned bores in said plates, each bore having a diameter to center the pins in the plates and an enlarged diameter to form a circumferential recess to receive welding material for securing the pins to the plates, and roller cutter means mounted on each pin between said plates.

14. .A reamer cutter assembly comprising a pair of plates, a bearing pin fixed to each plate'with its ends projecting therebeyond, and roller cutter means mounted on said -pin between said=fliatea JOHN A. 

